The fourth official has signalled for three minutes of additional time at the end of the second half.
89'
E. Hysaj gets yellow.
Hysaj earns a late yellow card for kicking out at Jovancic and then tugging the shirt of the Red Star man.
88'
Napoli are knocking the ball around their defence as they look to run down the clock. Ancelotti's side are set to extend their unbeaten record in the group stage this season to five matches.
86'
M. Rog enters the game and replaces José Callejón.
Third a final change for Napoli as Ancelotti introduces Rog for a late cameo, with Callejon making way.
85'
SAVE! Ospina is forced into action as he gets down low to palm away Ebecilio's driven effort, with Ben flagged offside as he looks to latch onto the rebound.
83'
Over in Paris, PSG still lead Liverpool 2-1 and that means that Napoli still have work to do in their final match in the group if they are to seal their spot in the Round of 16.
81'
M. Gobeljić gets yellow.
A fierce sliding challenge from Gobeljic is late on Rui and the Red Star full-back picks up a deserved booking.
79'
Red Star continue to enjoy spells in possession but they have been unable to carve their way through the Napoli defence, which has stood firm since the visiting side pulled one back.
77'
L. Ebecilio enters the game and replaces V. Simić.
P. Zieliński enters the game and replaces L. Insigne.
Red Star also make a change, their last of the game, as they bring on Ebecilio for Simic.
Napoli make a switch in midfield as Insigne, who has been extremely lively and influential, is replaced by Zielinski.
Minute
Description
75'
D. Jovančić gets yellow.
Jovancic becomes the second Red Star player to be booked in the game after being beaten by Allan's skill and responding by pulling the shirt of the Napoli midfielder.
74'
Edging ever closer to the final whistle and the match seems to have completely lost its sting. However, Red Star continue to venture forward and another goal for the Serbian side would set things up for a very tense finale.
72'
Jovancic argues with the referee after an aerial challenge with Ruiz but there was not too much in that at all, so there is no reason why the Red Star man should feel aggrieved.
70'
Napoli have taken their foot off the gas in the past few minutes and this has allowed Red Star to see more of the ball, pegging the hosts back inside their own half. However, they have been unable to threaten Ospina.
68'
Red Star win a corner after venturing forward down the left side. The visitors play it short before working it to the edge of the box where Krsticic is waiting but his effort is woeful, floating high above Ospina's crossbar.
66'
The tempo of the match has decreased significantly since the visiting side pulled one back but it is still Napoli who are enjoying the lion's share of possession.
64'
D. Jovančić enters the game and replaces S. Srnić.
Second change of the game for Red Star as Jovancic takes the spot of Srnic.
62'
A reminder that, as it stands, Napoli's spot in the knockout stages will not be secured despite their lead due to the score in Paris. PSG currently hold an advantage against Liverpool and Ancelotti's side need an equalising goal from the Reds if they are to secure their spot in the Round of 16.
59'
The visiting fans have something to celebrate from their trip to Naples but it looks unlikely to change the picture significantly. Napoli will be frustrated not to keep a clean sheet but they still have firm control on this match.
57'
E. Fardou Ben Mohamed has scored a goal for Red Star Belgrade! Assist by M. Marin.
GOOOOAL! 3-1! Marin weaves his way into a position to feed a fine ball through the Napoli defence to Ben, who gets the wrong side of his markers and slots a fine finish beyond the reach of Ospina.
Superb work from former Chelsea man Marin in a position where it looked like he could find no joy. He created space for himself and threaded a pass through to Ben with pinpoint accuracy.
56'
Napoli honestly look like they could score as many as they want to here and it is starting to look like a training game. While the hosts are firing on all cylinders, Red Star are sinking without a trace.
54'
Red Star look like they could be set to endure another thumping away from home in the Champions League group stages. They have already conceded six against PSG and four against Liverpool this season.
52'
D. Mertens has scored a goal for Napoli! Assist by M. Hamšík.
GOOOOOOOAL! 3-0! It's been coming and Napoli get their third! Mertens drifts into space and superbly brings Hamsik's through ball under control, cutting back across the defender before smashing a fierce effort into the net to double his tally in the match.
A goal and an assist for Hamsik now, who is pulling the strings in midfield and helping Napoli cruise into a comfortable lead.
51'
Another corner for Napoli comes to nothing, with Maksimovic unable to latch onto the cross into the middle, but it is further evidence of the dominating that Ancelotti's side are enjoying.
49'
The hosts are through again as Allan pokes the ball through to Insigne but he unselfishly tries to tee up Mertens rather than shooting himself and the defender clears away, with the resulting corner coming to nothing.
48'
Napoli are looking to quickly settle into the dominating tempo that they displayed during the first period but Mertens is flagged offside in his latest surge forward.
46'
D. Joveljić enters the game and replaces N. Stojiljković.
E. Hysaj enters the game and replaces Raúl Albiol.
Red Star's change sees Joveljic replace Stojilikevic, as the visitors look for something different in the final third.
Changes at the break for both sides, with Napoli introducing Hysaj in place of Albiol.
Red Star restart the action in Naples as the second half begins.
45' +4
N. Krstičić gets yellow.
The first yellow card is issued to Red Star captain Krsticic, who pulled back Insigne in midfield unnecessarily.
45' +2
Liverpool have pulled one back against PSG and it could be decisive, as an equaliser for Klopp's side in Paris would be enough to send Napoli through to the knockout stages.
45' +1
The fourth official has signalled for three additional minutes at the end of the first period.
HALF-TIME: NAPOLI 2-0 RED STAR BELGRADE
45'
Red Star tries to craft an attacking move down the left but Simic is flagged offside, moving far too soon.
43'
Edging towards the interval and Napoli are cruising, with Red Star unable to establish a foothold in the match.
41'
Albiol's sliced clearance hands Red Star a corner but Marin's whipped delivery is headed away by the imposing figure of Koulibaly.
39'
Napoli continue to bang on the door as they burst forward from a wide position once again and Callejon tries to curl home from inside the area but sees his effort blocked behind for a corner, which Red Star clear away.
37'
In the other game in Group C, PSG are now 2-0 up against Liverpool and it seems almost certain that nothing will be decided today. Things do look very good for Napoli though.
35'
That goal could be crucial as it should erase any nerves that are lurking inside the stadium. Red Star could certainly snatch one goal but it would be a major shock if they were to score twice. As it stands, the Serbian side are heading out of the Champions League.
33'
D. Mertens has scored a goal for Napoli!
GOOOOAL! 2-0! Ruiz's ball into the area takes a huge deflection off Degenek, falling kindly into the path of Mertens who stabs the ball past Borjan with the outside of his right foot.
30'
Half an hour played in Naples and the hosts continue to impress, finding plenty of room to work with in the wide positions. However, they have been unable to extend their lead.
28'
SAVE! Another fast flowing attack from Napoli forces a save from Orjan as Koulibaly flicks a header at goal that is tipped over the bar but the resulting corner comes to nothing.
27'
Napoli's dominance has decreased in the past 10 minutes or so, allowing Red Star to grow in confidence as they are seeing more of the ball and are able to settle into the game.
23'
First chance of the game for Red Star as they win possession back in midfield and Marin feeds through Rodic, who forces a fine save from Ospina. However, the offside flag is raised.
21'
The visiting side are just starting to enjoy spells on the ball but Napoli are tracking back in numbers, restricting the space available for the Serbian champions to work with.
19'
Red Star are encountering all sorts of problems in their attempts to deal with Napoli's high press. As soon as it looks like they will enjoy a spell in possession, they are quickly put under pressure.
17'
Napoli are cruising at the moment and the home fans are making their voices heard. From what we have seen so far, there is no sign of Red Star being able to cause problems.
15'
While Napoli hold the lead here, and look likely to extend their advantage, the news from Paris is not good as PSG have taken the lead. As it stands, Group C will be decided on the final matchday - but there is plenty of time for that to change.
13'
It is a goal that could be crucial for Napoli's Champions League hopes. If they are to secure qualification this evening, they need to ensure they win and must hope PSG do not beat Liverpool.
11'
M. Hamšík has scored a goal for Napoli! Assist by N. Maksimović.
GOOOOOAL! 1-0 Napoli! Insigne's corner into the area is flicked on by Maksimovic into the six-yard box where Hamsik is lurking, tapping home his first goal of the season to extend his tally as the club's all-time leading scorer.
Insigne's delivery into the box was sublime but Maksimovic's flicked header at the near post left the ball on a plate for Hamsik and things already look bleak for the visitors.
8'
Napoli appear to be in the mood and are moving the ball around excellently in the opening exchanges. Callejon and Insigne are already causing the Red Star defence plenty of problems.
1'
We are underway at the Stadio San Paolo, where Napoli get the action started in their bright blue and lime green kit.
Hello and welcome to our LIVE commentary of the Champions League clash between Napoli and Red Star Belgrade, where the two teams are fighting to extend their European adventure.
Group C is incredibly tight this season and Red Star's win over Liverpool last time out has left things wide open, with all four teams capable of qualifying for the knockout stages. Neither Napoli nor Red Star will be able to secure qualification on their own tonight as they need the result between Paris Saint-Germain and Liverpool to go in their favour, though a victory for the hosts would knock the Serbian side out.
Napoli XI (4-4-2): David Ospina; Nikola Maksimovic, Raul Albiol, Kalidou Koulibaly, Mario Rui; Jose Callejon, Allan, Marek Hamsik, Fabian Ruiz; Dries Mertens, Lorenzo Insigne.
Napoli subs: Orestis Karnezis, Elseid Hysaj, Arkadiusz Milik, Amadou Diawara, Piotr Zielinski, Marko Rog, Kevin Malcuit.
Red Star XI (4-2-3-1): Milan Borjan; Veljko Simic, Srdjan Babic, Milos Degenek, Milan Rodic; Marko Gobeljic, Nenad Krsticic; El Fardou Ben, Marko Marin, Slavoljub Srnic; Nikola Stojiljkovic.
Red Star subs: Zoran Popovic, Milan Pavkov, Dejan Joveljic, Lorenzo Ebecilio, Dusan Jovancic, Jonathan Cafu, Rashid Sumaila.
Red Star coach Vladan Milojevic makes four changes to the side that stunned Liverpool last month as he brings in Simic, Babic, Gobeljic and Stojilikovic. Jovancic and Pavkov, the latter of whom scored both against Jurgen Klopp's side, take a spot on the bench, while Filip Stojkovic and Vujadin Savic are not in the squad.
The two teams are heading onto the field in Naples ahead of the start of the game for what could be a very tense affair.
It is all going perfectly for Ancelotti's side so far as Napoli hold a comfortable cushion at the break courtesy of goals from Hamsik and Mertens. Red Star have been unable to offer anything in attack and they look set to be knocked out of the Champions League.
Napoli fans will be playing close attention to the score between PSG and Liverpool in the second half, as a draw there would be enough to send the Italian side through if they hold onto their lead - which they should look capable of extending.
Thanks for joining our coverage today. Until next time, goodbye.
Napoli will now turn their attention towards Monday's clash away from home against Atalanta, before finishing their Champions League matches in two weeks at Anfield against Liverpool. Meanwhile, Red Star have three domestic matches before hosting PSG in their final match - where a famous victory would send them through to the Europa League.
The full-time result in Paris sees PSG beat Liverpool 2-1, which means that Napoli have not secured their spot in the knockout stages despite their comfortable win. Carlo Ancelotti's side top the group heading into the final round of matches but still have work to be done.
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